Abstract
Local atomic arrangements in a short-range ordered (SRO) ternary alloy system are discussed from the theoretical viewpoint of microdomain structure. Initial idea of the structure originated in the microdomain model (in which a long-range ordered atomic arrangement is formed within a tiny region) to explain the origin of the fine distribution on diffuse intensity maxima appearing in the SRO Cu-Au alloys {Hashimoto: Acta Cryst. A30, 792-798, (1974) } . Application of the model to the ternary alloys concluded that a negative partial intensity of diffuse scattering, which arises from the pairwise correlation between two different kinds of atoms, is caused by a mixing occupation of the two relevant atomic species on the sublattice in the ordered lattice within microdomains. Partial diffuse intensity maxima, which can be obtained by the anomalous scattering method by use of synchrotron radiation, turned out clearly to show the structural properties of the ternary alloy.
